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Fix a bunch of things from Chris' feedback

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38493 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2007-07-10 17:08:11 +00:00
parent 02e25b70aa
commit 6b278fc786
2 changed files with 50 additions and 34 deletions
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8
include/llvm/Analysis/MemoryDependenceAnalysis.h
View File

@ -28,7 +28,7 @@ class Function;
class FunctionPass;
class Instruction;
class VISIBILITY_HIDDEN MemoryDependenceAnalysis : public FunctionPass {
class MemoryDependenceAnalysis : public FunctionPass {
private:
DenseMap<Instruction*, std::pair<Instruction*, bool> > depGraphLocal;
@ -44,10 +44,12 @@ class VISIBILITY_HIDDEN MemoryDependenceAnalysis : public FunctionPass {
/// Pass Implementation stuff. This doesn't do any analysis.
///
bool runOnFunction(Function &) {
bool runOnFunction(Function &) {return false; }
/// Clean up memory in between runs
void releaseMemory() {
depGraphLocal.clear();
reverseDep.clear();
return false;
}
/// getAnalysisUsage - Does not modify anything. It uses Value Numbering

76
lib/Analysis/MemoryDependenceAnalysis.cpp
View File

@ -40,8 +40,8 @@ void MemoryDependenceAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
}
/// getDependency - Return the instruction on which a memory operation
/// depends. NOTE: A return value of NULL indicates that no dependency
/// was found in the parent block.
/// depends. The local paramter indicates if the query should only
/// evaluate dependencies within the same basic block.
Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
bool local) {
if (!local)
@ -60,51 +60,68 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
QI = cachedResult.first;
AliasAnalysis& AA = getAnalysis<AliasAnalysis>();
BasicBlock::iterator blockBegin = query->getParent()->begin();
TargetData& TD = getAnalysis<TargetData>();
// Get the pointer value for which dependence will be determined
Value* dependee = 0;
if (StoreInst* S = dyn_cast<StoreInst>(QI))
uint64_t dependeeSize = 0;
if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
dependee = S->getPointerOperand();
else if (LoadInst* L = dyn_cast<LoadInst>(QI))
dependeeSize = TD.getTypeSize(dependee->getType());
} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
dependee = L->getPointerOperand();
else if (FreeInst* F = dyn_cast<FreeInst>(QI))
dependeeSize = TD.getTypeSize(dependee->getType());
} else if (FreeInst* F = dyn_cast<FreeInst>(QI)) {
dependee = F->getPointerOperand();
else if (isa<AllocationInst>(query)) {
// FreeInsts erase the entire structure, not just a field
dependeeSize = ~0UL;
} else if (isa<AllocationInst>(query)) {
// Allocations don't depend on anything
depGraphLocal.insert(std::make_pair(query, std::make_pair(None,
true)));
reverseDep.insert(std::make_pair(None, query));
return None;
} else {
// Non-memory operations depend on their immediate predecessor
--QI;
depGraphLocal.insert(std::make_pair(query, std::make_pair(QI, true)));
reverseDep.insert(std::make_pair(QI, query));
return QI;
}
} else
// FIXME: Call/InvokeInsts need proper handling
return None;
// Start with the predecessor of the queried inst
--QI;
TargetData& TD = getAnalysis<TargetData>();
BasicBlock::iterator blockBegin = query->getParent()->begin();
while (QI != blockBegin) {
--QI;
// If we've reached the pointer's definition...
if (QI == dependee) {
depGraphLocal.insert(std::make_pair(query, std::make_pair(QI, true)));
reverseDep.insert(std::make_pair(QI, query));
return QI;
}
// If this inst is a memory op, get the pointer it accessed
Value* pointer = 0;
if (StoreInst* S = dyn_cast<StoreInst>(QI))
uint64_t pointerSize = 0;
if (StoreInst* S = dyn_cast<StoreInst>(QI)) {
pointer = S->getPointerOperand();
else if (LoadInst* L = dyn_cast<LoadInst>(QI))
pointerSize = TD.getTypeSize(pointer->getType());
} else if (LoadInst* L = dyn_cast<LoadInst>(QI)) {
pointer = L->getPointerOperand();
else if (isa<AllocationInst>(QI))
pointer = QI;
else if (FreeInst* F = dyn_cast<FreeInst>(QI))
pointerSize = TD.getTypeSize(pointer->getType());
} else if (AllocationInst* AI = dyn_cast<AllocationInst>(QI)) {
pointer = AI;
if (isa<ConstantInt>(AI->getArraySize()))
pointerSize = AI->getZExtValue();
else
pointerSize = ~0UL;
} else if (FreeInst* F = dyn_cast<FreeInst>(QI)) {
pointer = F->getPointerOperand();
else if (CallInst* C = dyn_cast<CallInst>(QI)) {
// FreeInsts erase the entire structure
pointerSize = ~0UL;
} else if (CallSite* C = dyn_cast<CallSite>(QI)) {
// Call insts need special handling. Check is they can modify our pointer
if (AA.getModRefInfo(C, dependee, TD.getTypeSize(dependee->getType())) !=
AliasAnalysis::NoModRef) {
if (AA.getModRefInfo(C, dependee, dependeeSize) != AliasAnalysis::NoModRef) {
depGraphLocal.insert(std::make_pair(query, std::make_pair(C, true)));
reverseDep.insert(std::make_pair(C, query));
return C;
@ -115,9 +132,8 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
// If we found a pointer, check if it could be the same as our pointer
if (pointer) {
AliasAnalysis::AliasResult R = AA.alias(
pointer, TD.getTypeSize(pointer->getType()),
dependee, TD.getTypeSize(dependee->getType()));
AliasAnalysis::AliasResult R = AA.alias(pointer, pointerSize,
dependee, dependeeSize);
if (R != AliasAnalysis::NoAlias) {
depGraphLocal.insert(std::make_pair(query, std::make_pair(QI, true)));
@ -125,8 +141,6 @@ Instruction* MemoryDependenceAnalysis::getDependency(Instruction* query,
return QI;
}
}
QI--;
}
// If we found nothing, return the non-local flag